Because each period of life brings its own form of joy and challenge.

因为生命的每个阶段都有它自己的欢乐和挑战。

youdao

Artists and scientists alike are immersed in discovery and invention, and challenge and critique are core to both, too.

艺术家和科学家都应沉浸在发现和发明中，挑战和批评也是双方需聚焦的核心。

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When we are looking at the life of a tree, we learn about that each period of life brings its own form of joy and challenge.

当我们观察一棵树的生命时，我们了解到生命的每一个阶段都有它自己的欢乐和挑战。

youdao

Republicans have taken aim at that, as they continue to attack Mr.Obama on several fronts and challenge the White House over deficit spending and rising debt.

VOA: standard.2010.07.19

Are you among those more comfortable, have you taken any computer science, were you programming at the age of 10 but you'd actually like to learn a bit about things you don't yet know and challenge yourself with new content or are you somewhere in between?

你对电脑比较熟悉么，你上过计算机专业方面的课程吗？,你是不是10岁就会编程,来上课的目的只是为了学习未知的知识,或者用新知识来挑战战自我？,还是二者兼有？

哈佛公开课 - 计算机科学课程节选

So I think that it's true that the economy is difficult and there is big challenge in front of us.

所以我觉得，目前的经济形势真的很困难，我们面临着很大的挑战。

事业就是挑战 - SpeakingMax英语口语达人

Cezanne's death created a vacuum and challenge: Who would or could pick up the great man's gauntlet?

BBC: Too famous to see?

Yeah. 50 likes - I think 50 likes fights and he likes to diss and challenge people.

NPR: Lifestyle & Trends: Kanye West, 50 Cent Do Battle

The limitation for producing creative content in six seconds is both the beauty and challenge of Vine.

CNN: 20 fun and useful new mobile apps